CYTOLOGICAL OBSERVATIONS ON SPERMATOGENESIS IN FOUR SPECIES OF MECOPTERA

Abstract

Spermatogenesis was examined in Panorpa anomala, P. acuta, Bittacus pilicornis and B. stigmaterus. Both species of Panorpa were found to be achiasmate and had a chromosome number of n = 22 + X(O). The behavior of the sex bivalent and frequency of end-to-end association among non-homologous chromosomes is discussed for the Panorpa species Bittacus pilicornis (n = 14 + X[O]) and B. stigmaterus (n = 15 + X [O]) had chiasmate meiosis